Patent GB-851360-A (GB)
Title: Improvements in or relating to eyeletting machines
IPC: A43D100/02
Filed: 1957-02-25
Abstract: 851,360. Eyeletting. BRITISH UNITED SHOE MACHINERY CO. Ltd. Feb. 25, 1957 [Feb. 23, 1956], No. 6179/57. Class 83 (4). A fastener-inserting machine for use in inserting, eyelets one at a time in a workpiece having a series of irregularly spaced apart holes comprises inserting means by which the eyelets may be successively inserted in the workpiece, a work-holder for supporting the workpiece, drive means for intermittently moving the work-holder to locate successively each of said holes in the workpiece supported thereon in operative alignment with the inserting means, and a motion limiting detent member intermittently movable into and out of engagement with a template device provided by the workholder and which acts to lock the work-holder against further movement while an eyelet is being inserted in one of said holes. In an embodiment an eyeletting-machine comprises a power-operated inserting-tool 12 reciprocated by a motor 20 and a pitman 16 on a main shaft 18. Eyelets are delivered to the eyeletting station along a raceway 10 from a hopper (not shown). The workpiece W, preformed with apertures arranged irregularly in a circular pattern, is supported on a base-plate 24 and located by anvils 22 and clamped by a spring- loaded sleeve 28. The base-plate is releasably engaged by a turn-table 30 connected to a shaft 36 journalled in a bracket 38, said shaft being driven through a friction clutch 40, 44, the spring-loaded member 44 which is intermittently oscillated by linkwork 50, 52, 54 and 58 actuated by a. cam groove on the shaft 18. Rotation of the shaft 18 also, through a cam 64 and a centrally-pivoted spring-loaded lever 70 slides a wedge-shaped detent 66 into and out of abutting engagement with adjacent anvils 22 to control the degree of rotatary movement to the turn-table and workpiece. The detent 66 may be manually disengaged by a handle 78 on the lever 70 to enable the work-holder to be removed from the machine. The face 82 of the detent always stops successive anvils as they are indexed in correct alignment with the tool 12 and the tapered face 80 exerts a pressure on the adjacent anvil to ensure the other anvil is held against the face 82. The detent moves in a plane closely adjacent the plate 24 so that the work-holder is securely held on the turn-table during normal reciprocation of the detent. Starting and automatic stopping of the machine is controlled by two micro-switches 84 and 86. The first is normally open and is closed by the operator to engage a clutch for driving the main-shaft 18. The second switch 86 provides a normally closed switch circuit for energizing the clutch-engaging solenoid after the operator has released the first switch 84, so restoring it to its normally open circuit position. The second switch 86 is operated by a lever 88 attached to a pivoted rock-shaft 90 which also carries a lever 92 having a rearwardly-extending arm 94. After a complete rotation of the turntable, an ear 96 on the turn-table rocks the levers 92 and 88 and depresses the switch 86 to stop the machine after the last eyelet has been inserted. A retaining notch 98 on the lever 92 engages the ear 96 and prevents accidental rotation of the turn-table while removing or installing a work-holder. An additional safety measure consists in fully retracting the detent 66 clear of the plate 24 and when retracted, a slide 100 secured to the detent, and carrying a cam face 102, is wedged against an abutment 104 on the arm 94 of lever 92, thus preventing any movement of the lever 92 such as might release the ear from the notch 98. Specification 741,566 and U.S.A. Specification 2,056,316 are referred to.